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Abstract

The nonreciprocal circular dichroism and Faraday rotation effect for terahertz (THz) waves in longitudinally magnetized InSb were investigated by theoretical and experimental studies in the THz regime, which indicated its ability for a THz circularly polarized isolator, THz circular polarizer, tunable polarization converter, and polarization modulator by manipulation of different magnetic fields. Furthermore, we demonstrated the InSb plasmonics based on its magneto-optical effects combined with artificial microstructure. We found the magneto-optical enhancement mechanisms in this magneto-plasmonic structure, achieving broadband near-perfect orthogonal linear polarization conversion modulated by the weak magnetic field in an experiment with an extinction ratio of 33 dB. Moreover, the magneto-optical modulation with an amplitude modulation depth of 95.8% can be achieved by this device under a weak magnetic field of 150 mT. InSb and its magneto-plasmonic device have broad potential for a THz isolator, magneto-optical modulator, and polarization convertor in THz application systems.

Figures (7)

Fig. 1. (a) Simulative carrier density of InSb at different temperatures; maps of the real part of (b) εL and (c) εR of longitudinally magnetized InSb in the THz regime under different magnetic fields from 0 T to 0.2 T; maps of theoretical transmittance (d) IL and (e) IR of longitudinally magnetized InSb in the THz regime under different magnetic fields from 0 T to 0.2 T; (f) map of the theoretical transmittance difference between the LCP and the RCP (IL−IR).

Fig. 5. Polarization state vectors of the transmitted THz wave through InSb when the input wave is an LP light: polarization state at (a) 0.7 THz and (b) 1.1 THz under different magnetic fields; polarization state under (c) 0.13 T and (d) 0.17 T at different frequencies.